English verb conjugation
MUST GASH

Regular verb: gash - gashed - gashed

Affirmation

Simple form	V-ing form
I must gash you must gash he must gash we must gash you must gash they must gash	I must be gashing you must be gashing he must be gashing we must be gashing you must be gashing they must be gashing
Perfect	V-ing perfect
I must have gashed you must have gashed he must have gashed we must have gashed you must have gashed they must have gashed	I must have been gashing you must have been gashing he must have been gashing we must have been gashing you must have been gashing they must have been gashing

Negation

Simple form	V-ing form
I mustn't gash you mustn't gash he mustn't gash we mustn't gash you mustn't gash they mustn't gash	I mustn't be gashing you mustn't be gashing he mustn't be gashing we mustn't be gashing you mustn't be gashing they mustn't be gashing
Perfect	V-ing perfect
I mustn't have gashed you mustn't have gashed he mustn't have gashed we mustn't have gashed you mustn't have gashed they mustn't have gashed	I mustn't have been gashing you mustn't have been gashing he mustn't have been gashing we mustn't have been gashing you mustn't have been gashing they mustn't have been gashing

Interrogative form

Simple form	V-ing form
must I gash? must you gash? must he gash? must we gash? must you gash? must they gash?	must I be gashing? must you be gashing? must he be gashing? must we be gashing? must you be gashing? must they be gashing?
Perfect	V-ing perfect
must I have gashed? must you have gashed? must he have gashed? must we have gashed? must you have gashed? must they have gashed?	must I have been gashing? must you have been gashing? must he have been gashing? must we have been gashing? must you have been gashing? must they have been gashing?

Interro-negative form

Simple form	V-ing form
mustn't I gash? mustn't you gash? mustn't he gash? mustn't we gash? mustn't you gash? mustn't they gash?	mustn't I be gashing? mustn't you be gashing? mustn't he be gashing? mustn't we be gashing? mustn't you be gashing? mustn't they be gashing?
Perfect	V-ing perfect
mustn't I have gashed? mustn't you have gashed? mustn't he have gashed? mustn't we have gashed? mustn't you have gashed? mustn't they have gashed?	mustn't I have been gashing? mustn't you have been gashing? mustn't he have been gashing? mustn't we have been gashing? mustn't you have been gashing? mustn't they have been gashing?